Complete change 5758: change member-vnf-index from int to string to allow symbolic names

Change-Id: Ib329d94a25b0231b8373b031651839e8b0b5cb6e
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/models/yang/project-nsd.yang b/models/yang/project-nsd.yang
index ae79d96..ace4102 100644
--- a/models/yang/project-nsd.yang
+++ b/models/yang/project-nsd.yang
@@ -63,7 +63,7 @@
           "Identifier/index for the VNFD. This separate id
            is required to ensure that multiple VNFs can be
            part of single NS";
-        type uint64;
+        type string;
       }
 
       leaf vnfd-id-ref {
@@ -97,7 +97,7 @@
           "Identifier/index for the VNFD. This separate id
            is required to ensure that multiple VNFs can be
            part of single NS";
-        type uint64;
+        type string;
       }
 
       leaf vnfd-id-ref {